#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <ctype.h>
 
int mygetch ( void ) 
{
  int ch;
  struct termios oldt, newt;
 
  tcgetattr ( STDIN_FILENO, &oldt );
  newt = oldt;
  newt.c_lflag &= ~( ICANON | ECHO );
  tcsetattr ( STDIN_FILENO, TCSANOW, &newt );
  ch = getchar();
  tcsetattr ( STDIN_FILENO, TCSANOW, &oldt );
 
  return ch;
} 
 
int main()
{
 
  int ch;
  char pword[BUFSIZ];
  int i = 0;
 
  puts ("Enter your password");
  fflush(stdout);
 
  while ((ch = mygetch()) != EOF 
          && ch != '\n' 
          && ch != '\r' 
          && i < sizeof(pword) - 1)
  {
    if (ch == '\b' && i > 0) 
    {
      printf("\b \b");
      fflush(stdout);
      i--;
      pword[i] = '\0';
    }
    else if (isalnum(ch))
    {
      putchar('*');
      pword[i++] = (char)ch;
    }
  }
 
  pword[i] = '\0';
 
  printf ("\nYou entered >%s<", pword);
 
  return 0;
}

if (ch == 0x7f && i > 0) 
    {
      printf("\b \b");
      fflush(stdout);
      i--;
      pword[i] = '\0';
    }